Koosvanwyk
Expert Member
- Joined
- Aug 6, 2015
- Messages
- 1,051
Most people can get by with a properly sized HF, if you're running very high surge devices like lots of pumps or big shop tools, which the OP is likely not doing, a LF inverter would be the way to go.@-=AlteredNeon=-
You need an inverter, not a UPS.
Preferably a low frequency inverter (i.e toroid transformer based), not the high switching crap 99% of inverters tend to be, especially if you intend to wire it into your house. (hint - if the inverter weighs less than 25 kg for 3kW, it is not a low frequency inverter)
You also need to bite the bullet and get lithium iron batteries for it (Iron, not ion. LiFePo cells are what you want)
You're looking at ~R11k for the inverter, and at 24V 100Ah ~ R9000 for the batteries (i.e. 2.4 kWh storage)
HF however dominates in residential application when wired into DBs, for good reason.
Modern HF inverters have become more efficient than their LF counterparts at a significantly lower price point. Their are lots of HF inverters on the market that than give twice their rated output for 10s, which in close to LF territory and more than sufficient time for devices that require a large start up power.
Just like you get HF crap, you get LF crap as well.