Recent content by kalisiak

Yes, actually, I just check the spec sheet again, and they are, in fact, LiPo. I'm planning on driving them at a maximum of 1/4C (they're rated at 4500mAh and 1C, but the overall BMS won't let me pull more than a maximum of 1A from each) only a couple times a year for critical loads when...

Each individual cell is unused, and has its own discrete BMS on it. The 420 cells (so that means four hundred twenty individual BMS circuits) are in two 7s30p groups, each group with a 7S 30A BMS. They will be stored in a large heavy-steel ammunition box with an L14-30 penetrating the side...

Understood, I know the BMS is not a charge controller, but the voltages that a 24V lead charger emits aren't anything that would cause a 7s 30A BMS to trigger. The upper end of the charging voltage from a 24V lead charger are less than or equal to the 7s max, and even the float charge at...

The Eco-Worthy unit is an all-in-one, actually, with only the ability to switch between "AC primary" and "Battery primary". - When it's on "AC primary", it's basically a 3000W UPS, and will use AC to charge the batteries, or solar panels in PWM, but other than that the AC is passthrough. -...

Is there a reason why you would stay away from a lead charger? The details of the charge characteristics aren't the same, but there doesn't seem to be anything incompatible with a 7S pack as far as voltage is concerned, and the total pack will actually be 2x(BMS7s@BMS30p), and the charge current...

Hello all, I don't think this is particularly dangerous, but it's not typical, so I figured I would post it here. I'm wondering if there's any reason why you couldn't pretend that a 7s LiPo is actually a 24V lead battery. Looks like from a bit of Googling that the absolute maximum voltage...

@TheDroidsYouAreLookingFor How is your system holding up? I've been interested in throwing something together myself for a while, using some cheap used panels. Thanks, Chris

Seeing as how I didn't actually pay anything for these batteries, I was going to go with 3V and 4.2V. But I'll run with the other voltages that were suggested in this thread. I should have enough capacity to power the devices that I'm planning on powering, but I can leave room for expansion to...

When I broke the pack down last fall, I depleted the cells down to about 3.7V. I don't trust nickel strips with a melange of cells, and instead use spring terminal cell trays with a 12GA bus bar, so I was able to pull all the individual cells out of the pack. They are stored in such a way that...

Yes, they are LiPo 18650's. I tore apart a bunch of retired laptop battery packs, graded the cells, and reserved 96 of the best ones with the intention of going to 6S16P. (If I move to 8S, I'll probably switch to 8S12P.) I'll be housing them in a heavy-gauge locking ammo box with an inch or so...

By the same token, if these cells will be underdriven anyway, and used to power ~50-60W worth of electronics via https://www.amazon.com/gp/product/B08318HXL3, I might be better off just going with 8S and then buck it down to 24V? The solar panels are 39V Vmp, so 8*4.05=32.4V would be closer to...

Thanks for the feedback! I don't remember why I decided on 6S, I think it just seemed reasonable at the time, based on the loads that I was originally planning -- I was going to use this kit last year to power a bunch of Peltier coolers to turn an antique ice box into a refrigerator. I built...

Hello! I'm new to the site, but have been dabbling in various solar DIY projects over the last 15-20 years. I currently have a 135W panel charging a couple of SLAs via a Renogy Wanderer 10A, which I use for LED lighting and USB webcams for a feral cat shelter that I built a couple years ago...