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I should probably draw a whole diagram of this but I can't today. I'm making a small off-grid cabin. There are 3 rows of 4 solar panels on the main roof 12 total. Two smaller ones next to it on a shed. The wires for the solar panels that are charging the battery come down near the front of the...

How do you derate multiple solar wires conduit? The wire will have 26.32 amps. 1.25 (80% rule) x 1.25 (solar source/cloud edge effect) = 1.56. If there are more than three current carrying conductors in a conduit? Does the multiple conductor derate get added to that or is it included already...

I bought 16 LiPo4 cells 16 months ago but haven't charged them yet. They were stored in a air conditioned storage unit for 7 months then a shipping container that sometimes had the doors open but usually got hot inside for 5 months and then indoors for 4 months. They are 100 AH prismatic cells...

Would installing a air conditioner condensate drain line inside of wall caused the pipe to sweat on the outside because of the cold water. This would added moisture inside of the exterior wall might lead to mildew in the wall or on the drywall. Has anyone built a AC drip line into the wall and...

Would installing a air conditioner condensate drain line inside of wall caused the pipe to sweat on the outside because of the cold water. This would added moisture inside of the exterior wall might lead to mildew in the wall or on the drywall. Has anyone built a AC drip line into the wall and...

Some background: I have a small solar cabin. The cabins electricity runs off a 600 amp hour 24 volt battery. The main battery cables are 4/0 with a 400 amp fuse. The 24V inverters are equipment grounded to Victron negative bus bar using 2/0. (The inverters also have 2/0 conductors). I bought 2/0...

Does anyone know if a 240V wall oven would run of 240V (hot to neutral) instead of 240 (L1/L2, hot/hot, split phase). I just have 120 and I can't think of any other 240V appliances I would want so I was wondering if a oven would run off a step up transformer. I realized the step up transformer...

I'm look for a 24 hour timer that can switch a low amperage DC relay circuit between two branch circuits. The timer would be set so during the day contact A would be connected to B and closed to C and at night contact A would be connected with C and closed to B. I have no idea what this would be...

I need to fit a 30A fuse in a Victron lynx distributor. Is there any fuse reduce or adapter that would allow me to do this. I want to connect my Victron Orion-Tr 12/24 through the lynx. I'm tring to keep the system as simple and neat as possible. I Know I could just put a wire or bar through the...

Has anyone used these flexible solar panels by top solar? Do you like them? They recently dropped in price! Going to put 2 of the 100 watt ones on top of a cargo box. https://www.amazon.com/gp/product/B08MKSG4B9/ref=ox_sc_act_title_3?smid=A3AL79HK0411E6&psc=1

Does anyone know of a DC blade style fuse box with a negative bus bar behind the positive. All the ones I can find have it either on top, bottom or on the opposite side of the negative. I really want one were both positive and negative contacts are on the same side. I know that could be...

I know you fuse wires not x.... So please don't comment that. I'm trying to determine what size fuses to use with my 24V system. How much larger then the load should fuses be. I read a number of different answers given online ranging from 20-50% larger? My DC fuse panel is rate for 100a...

Does anyone have any open loop solar water heating. Using either commercial or DIY solar collectors. This could be plastic or copper tubing as well. I live in Hawaii so there's no need for a closed loop system or glycerol. Do you recirculate the water from the cold side of the water heater back...

My set up is a 200ah 24V battery made with 16 Frey (Fortune) 100ah cells). Between the battery box and the rest of the power system is a 32 in long chee fridge/freezer. Everything will be mounted fairly close together with room for air to circulate on a plywood sheet. The DC-DC charger will have...

Is there a BMS that allows the user to save different charge profiles and easily change between them either by clicking a button or using an app. Have 1 to charge to 75% and cut off at 25. Another to charge to 85% and another for 90. If your just running a fridge during the day perhaps you don't...

Does anyone know how many amps a water heater circuit board and thermostat draws if there is no element connected. I plant to use a DC heating element connected to the battery using a relay. If the heating element isn't power through the AC power supply, how many amps would the other electronics...

To determine the wire gage I need I first need to determine circuit length. Is the starter battery to dc-dc charger to BMS to battery to fuse box to appliance/load one big circuit? Are they separate circuits? Thanks

I am considering using a Electrodacus BMS. Or should I use a solid state BMS like JDB. I am so confused. I've read the heard stories about fets burning out with solid state. I know you can also use a relay with some solid state BMS and use it shut down the inverter or close a circuit. Does...

Does the ampacity of the negative wire need to be 1.56% the ISC current rating of the panels (all panels in parallel) or can it be 1.25%? The positive side of the circuit will have OCPD and the wires before the circuit protection device will be rated 1.56% ISC. The negative connects directly to...

What size battery cable for 300A? All the charts I find for battery cable sizing only go to 230 or so. I find welding cable charts but that is for intermittent use. What would the appropriate wire gauge be for a 300 amp continuous rating with a roundtrip of 10ft. (Probably be less but playing it...

Has anyone used this power supply? I need one to initially charge and top balance my batteries. It seems to be the cheapest 4 digit digital, fine adjustment, 10A 30V battery charger on amazon. It has a 70% 5 star rating (131 reviews)...

How should I attach the 6awg wire to to the batter. I thought the vehicle s battery wires were claimed together. I was going to buy a terminal clamp with an extra hole however the battery vehicles battery cable is a different style. Should I just add the wire on top of the others on the terminal...

I am planning to build a 24v battery with 16 Grade-A Frey cells to make a 24V 200A battery (4.8 kWh). The cells will be put together in pairs to create "one cell" with busbars and then in a series (S8). Do the connections in a series need to be equal length? Can you use a cable to link some of...

I want to run a hot water heater off 24V DC battery power (24V 715 AH lithium). My idea was to connect the water heater to AC power and use the thermostat wires that would go to the heating element to activate a relay that would close a DC circuit to power a DC heating element. Are there low...

Is there a device that monitors multiple (dozens maybe?) thermasters/temperature sensors and sends a signal (example: relay circuit interruption) to trigger a action in another device. If you had temp sensors on cells but only one BMS temp sensor port. Is there we wait to have multiple sensors...

Has anyone ever used Flexible 2 Conductor Parallel Silicone Wire in a mobile application? Would this wire be acceptable or would you recommend something else...

I'm charging sets of 4 100aH cells fortune/frey in parallel (3.2V 400aH cell packs) to capacity test them. They started out at around %65 SOC. I am using a 10 amp bench charger. Using the cheap leads that came with the power supply I can only get 4.6 amps. Even after adding ring terminals on the...

What size ground wire do I need for panels with a combined ISC 132 amps. This is the ground wire that attaches to the rails that the panels are mounted on. The panels will all be in parallel. Do I multiply this number by 1.25 or 1.56. Some website say #6 is good to 200 amps for grounding solar...

I have two 24V/3000/70 multiplus inverters vectron says to use a 300A fuse. I'm using 250A fuses and 2/0 wire so I could put a 300A fuse if nessisary. The 12V version uses 400A fuse and the 48V 125A so I feel 250A is sufficient for mine. How big does the battery fuse need to be? Do you just add...

With my battery design I can't have the contacts/cables coming off the side due to space so I'm creating custom extended terminals. I'm going to have someone weld a coper rod (probably 3/4 in diameter and about 2 in in height) to the center of a busbar that connects the ends of the battery (each...