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I did a capacity test on my 9 years old Yuasa VRLA AGM 38Ah battery It lasted 5 hours 08 min at 0.1C (3.8A) and cutoff was set at 12V (which is - unless I'm wrong - equivalent to 50% DOD) The electronic load I'm using calculated a capacity of 19.41Ah Is it good? Seems to be exactly half of the...

When I put 12vdc, 120A and 3 feet, I get 4 AWG 4 AWG is the recommendation up to 160A For 165A, it shows 2 AWG So...................2/0 seems huge. Am I missing something?

When you say "AGM's are more or less bulletproof - can be mounted at any orientation, won't spill, don't need water, are vibration proof, and low self discharge"...you mean LFP?

Any idea why Giandel includes a 6 AWG set of wires? It's also the size they specify in their manual .....! I understand the math you provided, but if 2/0 is what I should use, it seems very weird the manufacturer talks about 6 AWG

So assuming the voltage goes as low as 10V, then it becomes 1200/10=120A 120 x 1.25 = 150A Are you saying I should double the 120A and use a 240A fuse?

Well, I've ended up ordering a Redodo 12V 100Ah for $255 on their Ebay store......hope to have it over the weekend. Need to decide on the charger (most likely Victron IP22 12V, 15A or 20A) - I need the storage function Also need to find a decent pure sine wave inverter in the 1,200W / 1,500W...

Exactly......to exercise the battery, I was thinking I could use the inverter to power the AC sump pump with a manual switch, and use it like that for couple days, then go back to grid power

Nice file......thank you for creating it and sharing it The Giandel pure sine wave 1200W is apparently cheaper on the Giandel site than on Amazon.......

Would this be a good choice (I like the possibility to manually switch the circuit) https://www.amazon.com/YOUNG-MARINE-Circuit-Trolling-Mount-50A/dp/B075KZTKDD or this: https://www.amazon.com/gp/product/B08ZXNZ3D3 with this: https://www.amazon.com/Conext-Link-AFS25-10-Nickel-Fuse/dp/B01D9ISXW6

How are you wiring the 3 batteries in parallel? I see 2 fuses......and how does the smart battery sense work exactly?

Ok for the MRBF fuse...how many amps should I get for a 2/0 AWG ?

Yes, this is why I mentioned the Victron... What about the wire size and fuse holder type?

thank you......Is it 13.4V or 13.8V? I see 13.8V for the NPB-450-12

Is there any good tutorial you could recommend? And about the cells to buy, can you provide a link? I looked at the Qishou website, but redirect to Alibaba?

Once the inverter's remote is activated by the sump pump switch......will it always stays ON?

It's frustrating..............LiFePO4 are apparently not ideal for standby solutions. The reviews about the Duracell GC2 batteries are not so great. So at the end, I'm not sure what to buy !

Which Victron charger did you end up buying? you mentioned the IP65, but how many Amps ?

What would be your recommendation for a decent 12V inverter in the 1,200W range (to power a sump pump) that has a low power consumption at idle? Thanks

For their 12V/110V 1200W, Victron specifies 2 AWG on the manual....

Well, their 12V 100Ah at $255 is tempting, as well as their newer Mini for $10 more.....

How is your system working for you? I'm in the exact same boat: 12VDC backup sump pump, with VRLA batteries that need to be replaced. I'm thinking going LiFePO4 with Victron Blue smart charger, but some people mentioned AGM are ideal for standby application.....So now making a decision is even...

Hello, I'm looking to upgrade to LiFePO4 for my 12V DC backup sump-pump (my AGM batteries need to be replaced) I'm looking for 100Ah (200Ah would be better, but then budget becomes an issue....!) Have you ever heard about PUPVWMHB batteries...

AGM (Absorbed Glass Mat) is a specific type of SLA or VRLA battery (Sealead Lead Acid or Valve Regulated Lead Acid )...correct? So if I were to go SLA, this one could be an option...

When we purchased our house 10 years ago, the basement was equipped with the usual sump pit and AC primary sump pump (a Zoeller I think) - Very common in Michigan. But I didn't like to rely on 1 pump only, especially knowing we could have power outages once in a while (ice storm, high winds...

OK, so I will have to pick a SLA/VRLA battery then....any recommendation for a charger?

Hello, Quick question, hoping it's not a stupid one: A low-voltage disconnect is somehow mandatory on SLA batteries to prevent deep discharge that would damage them But does the BMS installed in LiFePO4 (such as the Weize, Chins, Power Queen, Li Time, etc...) act as a LVD, thus a separate one is...

Well, I haven't replaced my batteries yet...Assuming I go with the "bullet proof" solution (2 x GC2 batteries in series), what would be the recommendation for a good charger, to keep them permanently charged? Also, being in a basement, is it safe to have such flooded lead acid batteries? Is...

This is from the Rolls Battery website: They seem to say it's for 50% DOD (10.5V), when you say I can use only half of the rating.....? I'm confused now.....

Hello I'm retrofitting some old solar garden lights to make them run out of 6VDC (2 leds in // and 47 Ohm resistors) Each lamp will draw ~0.75 Watts and I'm planning to have 10, so 7.5Wh But.....I don't want to run a 100 yard wire, bury it, etc... So I was thinking to have a LiFePO4 12V battery...

Has anyone tried the new Redodo power inverters (1000W and 2000W)?