- All REFERENCE VALUES are derived through Midtronics testing;
these are not values supplied by the battery manufacturer.
- Values are typical averages to be used as general guidelines
only; Midtronics encourages customers to establish their own
relevant testing values./li>
- These values are subject to change through Midtronics and
battery manufacturer refinement.
- Generally, a sample of 30 new or healthy batteries is tested
to obtain a value representative of a new battery on-line
after 90 days from installation.
- Test data was obtained at or adjusted to a nominal 25°C (77°F)
for consistency. Temperature changes strongly affect measured
conductance.
- Sizable differences between conductance value of a specific
battery and its value listed can result from many variations
in the way a battery string (system) was treated, installed
and/or maintained. It is imperative that ALL SITE TEST DATA
SHOULD BE RECORDED and made available for future on-site
visits and long-term site reference.
DETERMINING YOUR REFERENCE VALUES -GENERAL:
Batteries with the same make, model, power rating and age
(date code within 6 months) will generally conform to the model
below:
- New batteries will test within 10% of each other (+/- 5%) in
forming a healthy string.
- Batteries testing within 20% of each other (+/- 10%) still
tend to perform equally well during a timed discharge test.
- A battery that tests 30+% below the average conductance of
the highest 10 cells in a string will have difficulty making
80% of its rated capacity.
BATTERY TESTING PROCEDURE:
- COMPLY WITH ALL COMPANY POLICY AND BATTERY SAFETY RULES
WHILE TESTING BATTERIES.
- Always test on the lead post for the most consistent
results. Avoid tests on stainless-steel hardware or bolts -
lower measures will result.
- Operating conditions, site conditions, manufacturer changes
and other factors can vary test results. Retest to
verify any suspect test results.
- Permanent site records should include temperature, power
load, visual inspection, site condition, and battery rating,
voltage, and conductance data.
- Identify each battery with clear stenciling or labeling to
ensure subsequent data is correlated to the same battery.
- Testing through an Amp-type cable attachment will
significantly reduce test effectiveness - TEST ON BATTERY
POSTS BEFORE REPLACING
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