House batteries can mitigate the risk of power cuts and like ASHPs have become far more well known.[sixteen] Some ASHPs might be coupled to photo voltaic panels as primary Vitality source, with a standard electric grid as backup source.[citation necessary] R290 can realize high efficiency ranges having a+++ Power rankings https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/