Biochar dMRV Guide: Measurement & Verification

Two ways to fill a bag

Manual sampling, or every bag logged?

Manual sampling

MoistureOne grab sample a day
Likely error on dry mass±3%
Revenue lost a year–
What the auditor seesA spreadsheet

Automatic logging · BDV

See BDV

MoistureMeasured for every bag
Accuracy on dry mass±0.5%
Revenue saved a year–
What the auditor seesEvery bag, logged to the cloud as it fills

✓ Per-batch moisture, as registries require

Your line output, dry char150 kg/h

Revenue = bag sales + carbon credits. Bags at £450 per 1-tonne bag at ~30% moisture (0.7 t dry each); credits at ~1.6 t CO₂e per dry tonne × €130 (2026 market average) ≈ £110 at €1 = £0.85; 8,000 h a year. Error on dry mass: manual ±3% (a two-point moisture error at 30%), BDV ±0.5%. The error only ever costs money: bags are overfilled to stay clear of short-weight claims, and credits are paid on the conservative end of the measurement, so any over-claim is deducted at verification. Revenue saved = the manual loss minus BDV’s remaining 0.5%. Illustrative; your figures depend on price, feedstock, methodology and contract.

+2.9%

dry mass overstated by a two-point moisture error at 30%

Dry

mass is the basis registries calculate carbon removal on

3

samples per measured production batch under Isometric’s protocol

Every

bag: mass, moisture, temperature and ID, logged automatically

What dMRV is

Measurement, reporting and verification is the evidence trail that turns tonnes of biochar into verified credits. Digital MRV captures it with instruments at the point of production, so every batch has a timestamped, tamper-evident record an auditor can check: load cells for mass, an inline moisture sensor, temperature probes and a logger tying each reading to a bag.

What BDV recordsEvery bag logged as it is filled. Illustrative data, not linked to the calculator above.

BDV data loggerLine 1 · Bagging

LIVE

Bag mass1,012.4kg

Moisture29.6% wb

Char temp36.2°C

Dry mass today8.41t

moisturetemperature

Batch	Time	Wet kg	Moist %	Dry kg	Status
B-0419	11:03	512.4	29.6	360.8	● Recording
B-0418	10:42	1,008.0	30.1	704.6	Logged ✓
B-0417	10:21	1,015.2	29.4	716.7	Logged ✓
B-0416	10:00	996.8	30.6	691.8	Logged ✓

Export: CSV · API · audit pack

Why it matters now

Isometric’s biochar protocol quantifies on a dry-mass basis, needs at least three samples per measured batch, and expects moisture measured or controlled for every batch. Verra approved its first credits under a dMRV pilot in February 2026. Producers who hand over clean, instrumented data get through verification faster and are more attractive to buyers.

The numbers that matter

Measurement	Why it matters	Typical method
Wet mass	The starting point for every tonne claimed	Load cells or a screw / belt weigher
Moisture	Converts wet mass to dry mass	Inline microwave or NIR, checked against oven-dry samples
Temperature	Fire safety and the ≤40 °C shipping limit	Probe at the fill head
Batch identity and time	Traceability to storage or application	Logger with batch and bag IDs
Inoculant dose	Records what was added to charged char	Flow meters on each dosing line
Calibration records	Proves the instruments were right	Certified weights, oven-dry checks

Where manual MRV falls down

Transcription errors between scales, notebooks and spreadsheets.
Unrepresentative samples, especially for moisture: char straight from a quench is wetter than char that has stood.
Gaps in the record on busy shifts or when a sensor is offline.
Slow verification, as auditors reconstruct what happened.

If your char ships by sea, the same bag-level temperature record fills in the IMDG declaration. The ≤40 °C rule →

dMRV readiness checklist

Every bag or batch weighed on calibrated scales.
Moisture measured for every batch, not estimated from an occasional sample.
Temperature on the day of packing recorded for every bag.
Each reading tied to a batch ID, bag ID and timestamp.
Data captured automatically and not editable without a trace.
Calibration certificates current.
A batch report for registry, verifier and customers in minutes.

How we can help

BDV – Biochar Digital Verification

BDV systems meter, weigh, moisture-test and bag your char, logging every batch into a tamper-evident record. Sized from BDV-50 to BDV-1000 kg/h dry char, and retrofittable to existing lines.

See BDV Talk to us

Sources

General information, not certification or legal advice. Check the current version of your registry’s methodology and the IMDG Code with your verifier and carrier.