Im new to this caper as well, hopefully others have a better explanation. From what I gather an economiser is a device that helps hold the contactor closed using less current , and included a diode to reduce back EMF .
In my opinion, in the scheme of things any reduction in current to hold the contactor closed will be insignificant but adding a reverse biased diode would be handy , but I'd be surprised if one is not included in the controller design .
This eBay listing shows Contactor with Economomiser attached.
https://www.ebay.com.au/itm/Tyco-Ki...00-VDC-SPST-NO-Contactor-Relay-/132311466416?
(now I better go look at the Tyco / TE contactor that came with my contoller to see the fine print)
In my opinion, in the scheme of things any reduction in current to hold the contactor closed will be insignificant but adding a reverse biased diode would be handy , but I'd be surprised if one is not included in the controller design .
This eBay listing shows Contactor with Economomiser attached.
https://www.ebay.com.au/itm/Tyco-Ki...00-VDC-SPST-NO-Contactor-Relay-/132311466416?
(now I better go look at the Tyco / TE contactor that came with my contoller to see the fine print)