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I just acquired several UPS external expansion batteries that were BNIB, never been attached to a UPS, but have been sitting in box on a pallet for 'several years' - based on the manufacture date, I think somewhere around 2.5 years. So obviously, self-discharge is an issue. I was expecting them...

Does anyone have any experience with this charge/discharge meter:https://www.amazon.com/Charge-Discharge-DROK-Voltmeter-Watt-Hour-Multimeter/dp/B07YWVCBRN/ref=sr_1_35?crid=15KI8IZIMQPXI> If so, is it any good? If not, can anyone suggest something decent but not crazy expensive that'll track...

I'm looking into setting up a fairly small setup with two inverters, not because I need 6000w of power but for inverter redundancy, and I'm thinking of starting out with two 12v 100Ah LiFePo4 packs in series, which would provide 2400Wh of energy at 24v - roughly 4x the capacity of one of my...

I've got my really small experimental setup that has two 100w solar panels wired in series, connected to a Renogy Rover 40w MPPT charge controller, with a 35Ah Duracell deep cycle sealed/AGM battery, and the load on it consists of two PoE IP cameras, a really small switch, a wireless bridge and...

This is going to be a dumb noob questions... I've been running a Harbor Freight 100w solar panel for a small experiment setup and just grabbed a second one with the intent being to parallel them (They say not to use in series - any ideas why?), but they don't say anything about parallel. When...

I currently have my 'home lab' environment running on two APC SMX3000 UPS units. These units each have ten 5Ah batteries wired in series, giving an output voltage from the batteries into the inverter of about 136v fully charged. My math could be off, but as each 12v 5Ah battery has about 60Wh...