Recent content by HarryN

I have built both 24 and 48 volt systems, AGM and LiFe types. The big advantage of 24 volt systems, especially for a DIYer is the ease of finding components and end use devices that are 24 volt compatible compared to 48 volt. There are refrigerators, lights, chargers, USB chargers, fans, etc...

As a practical matter - my suggestion is to start by building a small 24 volt system at home to play with, and then work on building the 48 volt system. Even if you don't actually purchase a 24 volt inverter for the learning system, it will help a lot with building up the higher spec...

Just an FYI, the forum does not allow links to amazon like that. I know that you are just trying to be helpful. Added - ( AFAIK ) - could be completely wrong. Edited - thanks for the clarification. I have been avoiding linking to supplier web stores where people can find things for this...

If I am understanding things, your cabin is located in an area that routinely will be less than 30 F, a substantial portion of the year. The cabin is heated, but really only when you are there. There is enough snow for solar panels to be covered and not able to supply much power - routinely...

Thanks for writing it up. I like to put a breaker in between each battery pack and the bus bar. This makes it easier to: - Diagnose what is going on - Shut it down in sections in case something is not quite right - Re-set the BMS of that battery pack ( which often is done by completely...

Nice setup. Are you going to have any method to individually shut off / breaker / fuse each battery ?

For fun I looked up 40 lb force electric trolling motors. The link that came up was for a minn kota endura max 45 trolling motor. ( so 45 lbs ) The rated current was 42 amps. So ( 42 amps ) x ( 12 volt ) x ( 4 hrs ) ~ 2 000 watt - hrs. ____________ A typical example Li battery / size 27 is...

Take a look at the eco flow unit's 120 vac charger wattage rating. The inverter wattage rating will need to be at least 50% larger than that number to work and ideally double in order to use it for charging. What you are trying to do is not as easy as you think. It might make the most sense...

If your goal is to have a back up ( 12 volts ) separate from the ecoflow, then just build them separately and keep them separate. If you goal is to charge the Ecoflow from the Litime batteries, then just add an inverter and use the 120 vac charger from the ecoflow to charge it up.

Looks like a good project.

Usually the ecoflows and bluetti units are designed mostly for 120 vac output and really just a nominal amount of regulated 12 volt. If you need more than 10 - 15 amps of 12 volt, the usual method is to buy a 120 vac to 12 volt converter and feed that into a DC distribution box - or a pre-made...

Perhaps try to measure the panel Voc and see if it is roughly matching what you expect? Since you saw a voltage spike, I guess it is useful to see if the BMS has tripped.

Was it hydro ponics or ultra sonics ?

Definitely provide paths for air flow so that the hot air can rise off the panels as much as practical. My vote is to do everything possible to ensure that they are very securely mounted. Possibly even using the nuts with the plastic lock - I think they are called nylocks or something like...

If your goal is algae related, this outfit offers an interesting option using ultrasonics. https://www.hydro-bioscience.com/