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  • Post in thread: Alternative Backup Option

    Thank you Pollenface but im really looking for opinions or advice on the the use of Lithium batteries , if they can be left continuously on charge and suitable for going long periods without use . Not sure why you dont think i am cycling my AGMs , they are cycled daily , charged during daylight...
  • Post in thread: A Generator anomaly that's really got me puzzled.

    Will see what the generator manufacturer has to say after the holidays and post back here . Checked the htz and its between 48 and 51 but the voltage is stable within 1/10 of a volt AC . Although my batteries are almost full and in absorption I did just try selecting Automatic but the LED...
  • Post in thread: Backup Battery Setup

    I dont know low cut off because i never go below 50% they were extreemly expesive batteries , hard to know because the Fridge and the freezer cuts in and voltage drops below 23 for fraction of a secod , not long enough to see on a graph often but the lowest voltage is always recorded as around...
  • Post in thread: AGM vs Flooded Operating Illogically .

    Sorry 12Voltinstal , i should have typed 65 Watts not 65 amps so im not sure if 65 Wats would have much effect . I understand the point you make , the SOD is the same on both battery banks however the Percentage of Discharge has increased so the only concern being the night time usage the 100...
  • Post in thread: New to LifePO4 Lithium

    Thank you Sunshine for your explination , I hadnt reconised there was no current going in while there was voltage , makes sense to me now .
  • Post in thread: Backup Battery Setup

    My intention was to use a switch that would make conecting them both at the same time imporible , the the one you showed is ideal , 1 , 2 or OFF . My diagram was simplistic to ilistrate my concer which you both clarified and put my mind at rest on , which was using a common Negative which i feel...
  • Post in thread: Backup Battery Setup

    Thank you 12Volt , you clearly understood the question and your answer was exactly what i was hopeing to hear . My normal battery bank is more than sufficient for about 320 to 330 days a year but when the weather is bad its always the nigtimes that are a problem . At these times i have to start...
  • Post in thread: Voltage in wrong place

    Its AC and DC symbols together next to the settings , it recognises which is which when the probes touch and confirms on the screen which it is . Tried about 20 different meters and found this one to be an excellent meter and very accurate with both Voltages . Others mostly good up to 1/10 volt...
  • Post in thread: A Generator anomaly that's really got me puzzled.

    My normal generator is 1800 watts output and my battery charger is 20 Amps@ 24 volts and when batteries are low it shows the full 20 amp charge . Yesterday i bought a Goodyear 1100 watt ( 1000 nominal ) generator which i was very pleased with , started 1st pull and runs like clockwork at a...
  • Post in thread: What If

    I know that batteries should be connected before MPPT and when dissconecting the MPPT sould be first so what happens if the battery fuse blows while panels are still producing power , will the MPPT be damaged .
  • Post in thread: AGM vs Flooded Operating Illogically .

    I apologize in advance as this post is a bit long winded but i have tried to incorporate anything that might be relevant to the point of probable repeating myself . Hoping someone noticed the same phenomenon with AGM batteries compared to Flooded that would explain wha I am observing...
  • Post in thread: Voltage in wrong place

    Not sure what you mean . I did test the Amps output on some Solar panels that i had removed , by moving them around facing the sun while adjusting the angle they all eventually raised the output until they showed values reasonable close to the rated figures .
  • Post in thread: Voltage in wrong place

    I have an old Style Victron 150-70 Blue Solar MPPT , the one with a small screen and 4 buttons on the front for Setting up , Monitoring and reading History etc . The unit has been performing perfectly until About 2 weeks ago when i removed my 16 assorted sizes Poly Solar panels as they were...
  • Post in thread: AGM vs Flooded Operating Illogically .

    I have discovered that the end amps for Trojan to be 100% full is 0.05% of C20 which is 1.85 volts , done it a couple of times by turning off inverters about 20 mins before i know Charging time will end so theres no output only input for that time but mostly sticks around 2.8 volts 0.75% so...
  • Post in thread: A Generator anomaly that's really got me puzzled.

    Thanks Filter Guy , our 1800 is a Honda EU22i ( EU 2200I ) inverter Generator but i used to have a cheap 800 watt suitcase Inverter Geny and the same battery Charger produced the full 20 amps even with that . The new one i just bought is a normal generator with AVR , i only bought as a back up...
  • Post in thread: Voltage in wrong place

    The new Panels were wired for 100 volts coming in with but the issue came about the night before the new panels were installed and that night there were no panels at all connected to the MPPT . The screenshot is of last night which is typical battery voltage 24.7-24.9 , MPPT input termoals...
  • Post in thread: Coments and objective criticism needed

    Thank you i really o appreciate you taking the time to read and more importantly pass on your observations/thoughts which i have taken note off . In general i now feel more confident about making the final conections , the continuity i was seing in so many places was a concern and although i...
  • Post in thread: Reducing Voltage from 29 TO 28 Volts

    My system is 24 volt nominal 29 volt actual and i want to fit a small Computer type fan to turn on when a piece of equipment reaches a certain temperature . The only thing i am having problems with is finding a 8cm fan that will operate at this voltage , 5 , 12 , 24 and 48 are al no problem...
  • Post in thread: Alternative Backup Option

    Thank you 12voltinstalls for taking the time to write such a long post so i will do likewise to give as much info on my current system and needs . We already have 2240 watts @ 114 volts of panels supplying 400ah of AGM batteries which we used to replaced the flooded lead acid . Our 24 hour...
  • Post in thread: Mounting Board for Solar Equipment

    What are users mounting their Inverters , Charge Controllers and associated equipment on . I am in Spain and getting anything other than Wood or Steel sheet is very difficult .
  • Post in thread: Alternative Backup Option

    I hope the information i have passed on is correct , i have taken it from Victron VRM although voltages i used to worry about because when the batteries are on load its misleading and they appear lower than they are . I installed a Victron Shunt and those are the figures im seeing now , amazed...
  • Post in thread: Alternative Backup Option

    Thanks DIYrich , once the AGMs have started to fail i plan to replace them with Lithium lifep04 so its good to know thermal runaway is not a common issue with them however that will be some time away . The AGMs were expensive costing £2000 18 months ago and are four times the capacity i need at...
  • Post in thread: AGM vs Flooded Operating Illogically .

    Not sure i understand the question or the part about 12.1v being 100% usable discharge , i thought the either Flooded or AGM the DOD would be almost the same . The battery bank is 4x6v as i have a 24 volt system . Trojan give 24.45 as 50% depth of discharge and is the recommend figure to aim...
  • Post in thread: Manual Change over switch for DIN rail

    Is there such a thing as a Manual DC change over switch made to mount on a DIN rail inside a consumer box next to the Isolation switches and surge protectors , i dont want to install a stand alone one . Looked on Amazon and cant see anything but possible i don't know what they would be called .
  • Post in thread: Reducing Voltage from 29 TO 28 Volts

    Now had chance to try it but at the moment i only have a 12 volt motor and 12 volt x 20 watt halogen bulb but connecting just the motor i had 13.8 volts on Multimeter , with bulb in series that dropped to 12.8 which would be ideal except that a 20 watt bulb is far to big just as a small...
  • Post in thread: Voltage in wrong place

    I only have a Multimeter that reads up to 20 amps , i don't know if it helps or identifies anything but i set it to read Amps and the dial to " mA "and there was a tiny spark when i touched the probes to the terminal and the reading was 0.00 , when i changed the setting to " A "on the Multimeter...
  • Post in thread: Reducing Voltage from 29 TO 28 Volts

    You are totally wrong with your charging voltages Steve if your talking about Lead Acid battery which i have . Look at manufacture data sheets and you will be better informed . Rolls for instance , a leading make set Absorption voltages at over 29 volts . I have Trojan AGMs and charging voltage...
  • Post in thread: Alternative Backup Option

    Batteries and DC-DC charger ordered , now i jusy need to confirm how to wire everything . Looking for a change over switch ( centre of diagram )so that i can turn Off the feed to the Inverter from the BusBar and make a connection to it from the Lithium Battery , what type of switches would...
  • Post in thread: Alternative Backup Option

    For personal reasons I have to find an alternative backup method to a generator and considering installing a 24 volt 100ah stand alone lithium battery into our solar system which itself use 18 month old AGM batteries which are performing well . Daytimes we have far more coming in than we need...
  • Post in thread: Batteries change of Behaviour

    Would appreciate any suggestions or input on a situation my friends are suddenly encountering . Their Flooded batteries are around 7 years old and looking back via Victron Connect I can see they would normally spend several hours in Bulk then a few in Absorption but was rare for them to go into...
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