Panel Speakers

 DAEX58FP Flat Pack 58mm Exciter 25W 8 Ohm

Since my hearing is pretty shot and I havent listened to a pair of good speakers in a while I am finding it hard to judge how good these are. I am not a bass freak so I dont mind speakers being light on the "doof doof". These do seem to be very high end though bright verging on tinny. I would like to get a set of conventional speakers to compare them with. The choice however, inline with the availability of very high power >100 Watts D Class Amplifiers , look to be very inefficient. 

I need to track down a high efficiency old school 8 - 10 inch medium quality driver.

24 volt system .... Opps .... battery maintenance.

 820 GC2-145 6 - 260 260 180 295 33 J A

I am thinking each cell holds maybe 3 litres? I needed to put in a litre for every cell. 

I swear I checked them !! Clearly I didnt.  They were just totally going flat with virtually no load and plenty of charge.  I bought them when I was in Melbourne and the thick of the coof ...gotta be 2020 ? 

Anyways I pulled them out and topped them up and a have them charging. I am thinking an 8 amp charger should take ...2 days ? to deliver 260 AH ?  

They are on 6.1 ish and after half a day one went up to 6.5 ish... but sagged back down to 6.2 after being removed from the charger. 

They weigh 30 some kg and probably why I kept putting off checking the electrolytes... first (and likely only ) time I did I pulled them out since checking in situ seemed like , not an option.  Well it isnt. Have to have a way of checking electrolyte levels in situ...  They are too heavy to just pull out ..too dangerous on the back ... 

But I am not keen to put them back in service ... I dont know what usefull life they have left.  

Lituum batteries are expensive but getting cheaper all the time .. They dont need maintenance ..can be discharged to 20 percent with no damage. 

and Rule of Thumb have a life of 3000 against 500 cycles ... Sure they are expensive ... but maybe replace the wet Lead Acid system? 

Home Assistant

I would like to run Home Assistant off the NUC next to Linux Mint. 

If I like the system and want to run it independently ogf the NUC I can think about putting it on a SBC. 

I would like to have a play with the setup before committing to buying / building Hardware. 

Ventoy: Multi-boot USB Drive Tool