On Thu, 2 Oct 2025 at 19:48, '[email protected]' via weewx-user < [email protected]> wrote:
> On the other hand, maintaining a 100% SoC is one of the fastest ways to > degrade a LiPo battery. LiFePO₄ batteries are a better alternative in this > regard—they’re more tolerant of high SoC levels and have a lower risk of > fire. However, I’m skeptical that their lifespan would exceed that of > lead-acid batteries in a typical UPS scenario. > I've had a UPS with a 20Ah LiFePo4 battery in operation to keep a WiFi router in bridge mode powered up for an IP camera with a dodgy WiFi chip or something that constantly dropped out and it was pot luck if it would re-connect but works fine on Ethernet, since before COVID happily chugging along. I've bought other UPSs with LABs since then, and even replaced the batteries in one with fresh LABs. The last LAB replacement was to LiFePo4s though. > If your use case involves frequent and prolonged power outages, then a UPS > with LiFePO₄ batteries would be a better choice. Otherwise, a lead-acid > battery will serve you perfectly well. > This is exactly my situation and we just keep wearing out LABs as a result. When the power drops out here we usually get 2 quick outages followed by a 3rd much longer one that won't come back for 3-4hrs while the sparkies locate and rectify the fault. The 2 quick ones are probably an automated circuit breaker somewhere resetting and then giving up after failing to clear whatever is causing a short. We're almost at the end of the section of grid we're connected to and there is no substation connecting to multiple circuits. The 2 short drops in power would probably be dealt with ok by a UPS with a LAB, the 3rd time it drops for hours on end not only needs the higher energy density of lithium, but the ability for lithium batteries to be ok with a full discharge. The electronics in lithium batteries, apart from balancing the charge between cells, should prevent a lithium battery from actually fully discharging, as that will kill lithium batteries. In any case the thread author wanted protection for long, possibly multi-day outages, means they will need to get LiFePo4 batteries. -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/weewx-user/CAGTinV4W6DNbmqV0RkTzNW_Nv%3DoZfVh3d6FKKwR8nZg8xHKnhw%40mail.gmail.com.
