Hey everyone! I've been living off-grid in rural Oregon since 2018, using a solar setup cobbled together from various components I found on the cheap. It's been working reasonably well for six years, although it's nothing fancy. My current setup includes 4 x 100W solar panels, an HQST charge controller, a couple of 12V AGM batteries in series, and a budget inverter. Lately, however, our batteries can barely hold a charge, and I'm forced to use the generator for most of our heavier appliances. I'm considering upgrading to a 24V system and replacing my failing batteries. I'm torn between getting two new 12V batteries (which I can only afford one at a time) or just jumping to 24V with a set of 24V batteries. I heard that keeping a larger capacity battery might help, even if I use a single 12V battery for a while. What do you all recommend? Should I stick with 12V, go to 24V, or even consider 48V?
2 Answers
If you really want to stick with a simpler setup right now, 24V could be sufficient for your needs. However, remember that you'll need two 12V batteries wired in series to make it work, so if you want to begin with one battery now, you won’t be able to power a 24V inverter. Just know that using just one 12V battery might limit you until you get the second one. If you’re in a pinch, it might help a bit, but you’re really better off trying to get that second battery soon to keep your freezer in action!
Honestly, I'd suggest looking into a 48V system instead of sticking with 24V. While 24V might work for now, there's a good chance you'll need more power if your energy usage increases later on. It's true that 48V setups can be pricier, but if you want to avoid problems down the line, they could save you money overall. Also, don't forget that you can't mix battery voltages; you have to get the whole system aligned properly.
That's a good point about future-proofing. I’ve seen some decent 48V systems, but they often cost more upfront. Would you really need all that power, considering your current 400W solar panels? Seems like you’re managing even with your lower usage.
Exactly! It's a good idea to not push one battery too hard, especially if you need to keep your freezer running. Saving for that second battery should be a priority!