With the bosch drum, it’s my period of luck, recuperated, looks like! This inverter is obviously intended for the E project (as Echassier or (h) Eron) (I decided this is the official name following the find by Flytox of the emblem that would stick nikel to the project: https://www.econologie.com/forums/humour-t1191-2180.html )
Capacity: 1950W, 3000VA, True Online double rectification. Here is a commercial doc (slightly newer models because the EX30 is at 2100W, whatever): https://www.econologie.info/share/partag ... QfWNAm.pdf
When connected to the mains, the EX30 does not react at all, not even a "beep".
To start, I tackle the internal batteries to see if they are recoverable ...
There are 8 Yuasa 12V 7Ah lead batteries in series (it is the same "mold" as the cyclic solar batteries offered on the store), or 96V. These are "stand by" batteries.
Their unit voltage is very very low: 0.7V to 1.8V !!
It's extremely weak and I didn't think I could get it back, but apparently it's possible !!
So I proceeded as follows in several stages.
Method followed (apparently successful?):
a) stabilized voltage supply set 13 to 15V for approximately 10h: very low intensity
b) as the intensity increases: it starts at 0.1mA and goes up gradually, I stopped when it was around 300mA (which corresponds to a voltage at the no-load terminals at around 11.5V) by increasing a little (0.5V) every X hours the voltage
c) recharging by a tecmate (variable voltage battery optimizer charger, voltage delta and battery diagnosis after charging)
And against all odds apparently ... it works! Is it related to the fact that it is "stand by" batteries I do not know but it works when I had little hope of recovery!
The 1st of the 8 batteries has passed the test carried out by c) with success (it tests the battery at the end of the charge), the 2nd is currently in phase c) and 4 other batteries are in phase a).
I just have a doubt just for the one at 0.7V. I will do it last.
For the first 2 I used 2 stabilized laboratory power supplies (1 per battery). There I tested a second method for a).
I put 2 batteries in series (powered by 26 to 28 V) and 2 in parallel, we will see which method works best. I hope not to shoot down already weakened batteries!
In series it seems not bad because the voltage at the terminal of each battery varies (from 12 to 15V) and that is good (this is what the tecmate does in regenerative charge mode, deep discharge).
By cons must be monitored regularly so that it does not go up too much (neither in voltage nor in intensity).
Here is think of this small method before throwing a lead battery but above all do not try to recharge it with a "bourin" charger which is in constant intensity or worse at fast charge! (there is no better way to finish a weakened battery!). For a), if you don't have a stabilized lab power supply, I think we can use a stabilized feed of this type in 12V DC mode.
In fact, what is the "admissible" maximum voltage for a lead battery and for how long?
Here is the rest soon! For the rest of the inverter, if it's not an internal fuse (I've seen at least one) I'd do a "EX30 repair" topic. For the moment (with the flat batteries from flat) he was not reacting at all. I do not know the history of this inverter, I only know that it was stored for a long time without being plugged in.
ps: to anticipate a possible future question, the tecmate does not even react if you plug a 2V battery on it ...
This is why we can find them in good condition without a battery in all recovery pharmacies.
